Contact
    Start Publications Rh1−xPdx nanoparticle composition dependence in CO oxidation by ...
    ←  Publication Finder
    KSV NIMA

    Rh1−xPdx nanoparticle composition dependence in CO oxidation by oxygen: catalytic activity enhancement in bimetallic systems

    Year: 2011

    Journal: Phys. Chem. Chem. Phys., 2011, 13 (7), 2556-2562, 20131009

    Authors: James Russell Renzas, Wenyu Huang, Yawen Zhang, Michael E. Grass, Dat Tien Hoang, Selim Alayoglu, Derek R. Butcher, Franklin (Feng) Tao, Zhi Liu, Gabor A. Somorjai

    Organizations: Department of Chemistry, University of California, Berkeley, USA; Chemical Sciences Division, Lawrence Berkeley National Laboratory, Berkeley, USA; College of Chemistry and Molecular Engineering, and the State Key Lab of Rare Earth Materials Chemistry and Applications & PKU-HKU Joint Lab in Rare Earth Materials and Bioinorganic Chemistry, Peking University, Beijing 100871, China; Advanced Light Source, Lawrence Berkeley National Laboratory, Berkeley, USA; Department of Applied Physics, Hanyang University, Ansan, Korea 426-791; Materials Science Division, Lawrence Berkeley National Laboratory, Berkeley, USA

    Bimetallic 15 nm Rh1−xPdx nanoparticle catalysts of five different compositions and supported on Si wafers have been synthesized, characterized using TEM, SEM, and XPS, and studied in CO oxidation by O2 in two pressure regimes: atmospheric pressure and 100–200 mTorr. The RhPd bimetallic nanocrystals exhibited similar synergetic effect of increased reaction activity at both atmospheric (760 Torr) and moderate (100–200 mTorr) pressures compared with pure Pd or Rh. The magnitude of the effect depends on the relative pressures of the CO and O2 reactant gases and the reaction temperature. The catalytic activity of the nanocrystals measured at moderate pressure is directly correlated to the APXPS studies, which were carried out in the same pressure. The APXPS studies suggest that the Pd–Rh interfaces are important for the enhanced activity of the bimetallic nanoparticles.